"This wasn't a sleepy sigh."
"Say, Hal, what is the matter with you? You make me feel creepy."
"I heard a sigh."
Bert groped his way over to Harry's bed and sat down beside him.
"Say, old man, you're not asleep, are you?"
"No; Listen! There it is again."
The boys drew closer together and put out their hands until they touched one another. The sound they heard seemed to come from nowhere in particular.
"What do you think it is, Hal?"
"I don't know. Wait until we hear it again."
By this time their eyes had become accustomed to the darkness of the room, and aided by the star-lighted sky, they could see into every corner. There was no one in the room. Somewhat reassured they waited. The next time the sound was an unmistakable sob, and it seemed to be wafted through the barred windows on the still night air.